2007•Journal of Central South University(Science and Technology)Requires access
Electrochemical aspects of oxidation of arsenopyrite in the presence and absence of thiobacillus ferrooxidans
Guanzhou Qiu
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Abstract
The electrochemical research of asenopyrite in the presence and absence of thiobacillus ferrooxidans in acidic growth media was investigated.The results show that asenopyrite is firstly oxidized to AS2S2,which covers the electrode and the dissolution of arsenopyrite is retarded. As2S2 is oxidized to H3AsO3, H3AsO3 to H3AsO4,and Fe2+ is oxidized to Fe3+ with the increase of potential.The reactive nature of arsenopyrite is enhanced and the initial oxidation potential decreases when thiobacillus ferrooxidans are in the solution.The tendency of being oxidized and the corrosion rate increase compared to that in absence of thiobacillus ferrooxidans,but the reaction mechanism of arsenopyrite of anode process is not changed.The resistance in the presence of thiobacillus ferrooxidans is obviously lower than that in the absence of thiobacillus ferrooxidans.The proposed reaction mechanism confirms the results obtained in liner polarization satisfactorily.